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JEE Main202120 Jul 2021Morning ShiftChemistrySurface ChemistryActual

The conditions given below are in the context of observing Tyndall effect in colloidal solutions: (A) The diameter of the colloidal particles is comparable to the wavelength of light used. (B) The diameter of the colloidal particles is much smaller than the wavelength of light used. (C) The diameter of the colloidal particles is much larger than the wavelength of light used. (D) The refractive indices of the disperse

Options

  1. A( A ) and ( E ) only
  2. B( C ) and ( D ) only
  3. C( A ) and ( D ) only
  4. D( B ) and ( E ) only

Correct answer

A. ( A ) and ( E ) only

Step-by-step solution

The phenomenon of scattering of light by colloidal particles as a result of which the path of the beam becomes visible is called a tyndall effect. Smaller the diameter and similar the magnitude of refractive indices, lesser is the scattering and hence the tyndall effect and viced-versa. The diameter of the dispersed phase particle should not be smaller than the wavelength of light used because they won't be able to scatter the light so, therefore, the diameter of the dispersed particles should be equal or not m

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